TSL2580 Ver la hoja de datos (PDF) - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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TSL2580

LIGHT-TO-DIGITAL CONVERTER

TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS 

TSL2580, TSL2581

LIGHT-TO-DIGITAL CONVERTER

TAOS098 − MARCH 2010

Functional Block Diagram

VDD = 2.7 V to 3.6 V

Channel 0

Visible and IR

Channel 1

IR Only

Integrating

A/D Converter

ADDR SEL

Address Select

Command

Register

ADC

Register

Two-Wire Serial Interface

Interrupt

INT

SCL

SDA

Detailed Description

The TSL2580 and TSL2581 are second-generation ambient light sensor devices. Each contains two integrating

analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels

occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the

Channel 0 and Channel 1 data registers, respectively. The transfers are double-buffered to ensure that the

integrity of the data is maintained. After the transfer, the device automatically begins the next integration cycle.

Communication to the device is accomplished through a standard, two-wire SMBus or I2C serial bus.

Consequently, the TSL258x device can be easily connected to a microcontroller or embedded controller. No

external circuitry is required for signal conditioning, thereby saving PCB real estate as well. Since the output

of the TSL258x device is digital, the output is effectively immune to noise when compared to an analog signal.

The TSL258x devices also support an interrupt feature that simplifies and improves system efficiency by

eliminating the need to poll a sensor for a light intensity value. The primary purpose of the interrupt function is

to detect a meaningful change in light intensity. The concept of a meaningful change can be defined by the user

both in terms of light intensity and time, or persistence, of that change in intensity. The TSL258x devices have

the ability to define a threshold above and below the current light level. An interrupt is generated when the value

of a conversion exceeds either of these limits.

Copyright E 2010, TAOS Inc.

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www.taosinc.com

The LUMENOLOGY r Company

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